Control system for nitrogen filling of explosion-proof transformer

Abstract

The invention discloses a control system for nitrogen filling of an explosion-proof transformer, and belongs to the technical field of control systems. The data analysis module comprises an early warning unit, an analysis unit and a control unit; an upper limit triggering strategy is configured in the early warning unit, and the upper limit triggering strategy evaluates the current working state of the explosion-proof transformer through a set early warning threshold value and judges whether the explosion-proof transformer continues to work or not, so that the transformer is prevented from being damaged due to abnormal conditions of overheating, overvoltage and undervoltage; the analysis unit is used for analyzing the parameters and judging the safety of the parameters and the working state of the transformer; and the control unit is used for calculating the adjustment amount of each parameter according to the analysis result, formulating a corresponding adjustment strategy, and generating and executing an operation instruction, so that the explosion-proof transformer operates in a safe and stable range, and various safety accidents are avoided.

Description

Technical Field

[0001] The invention relates to a control system for nitrogen filling of an explosion-proof transformer, belonging to the technical field of control systems. Background Art

[0002] Transformers are one of the main equipment in power plants and substations. Transformers can not only increase the voltage to send electricity to the power consumption area, but also reduce the voltage to various levels of use voltage to meet the needs of electricity consumption. Transformers are equipped with oil tanks, which are filled with insulating oil for electrical insulation of the transformer body. If there are bubbles in the insulating oil, the insulation level of the transformer will be reduced, causing turn-to-turn breakdown accidents.

[0003] Transformer body nitrogen filling protection is a measure to protect the transformer body from the invasion of external humid air after the oil is drained and repaired during the transformer overhaul. During the transformer oil draining process, the insulating oil level gradually decreases, and the internal body slowly exposes the oil surface until the insulating oil is completely drained and the transformer body is completely exposed to the air. In order to prevent the oily insulating material of the body from moisture and aging, the transformer is filled with high-purity nitrogen with a purity of 99.99%, so that the internal pressure of the transformer is maintained between 0.01-0.03MPa, providing a slightly positive pressure nitrogen environment isolated from air for the body, so as to achieve the protection of the transformer body from moisture and oxidation.

[0004] The invention patent with the existing announcement number CN103824679B discloses an automatic nitrogen replenishing device for a transformer, which is connected to the transformer body and the nitrogen bottle respectively through the charging pipeline. The nitrogen replenishing device includes: a first one-way valve arranged on the charging pipeline between the transformer body and the nitrogen replenishing device, a second one-way valve arranged on the charging pipeline between the nitrogen replenishing device and the nitrogen bottle, a sensing unit, and a control unit. The sensing unit is used to measure the internal pressure of the transformer body. The control unit is used to open the first one-way valve and the second one-way valve when the internal pressure value is less than the first pressure preset value to allow nitrogen to be replenished into the transformer body, and is used to close the first one-way valve when the internal pressure value is greater than the second pressure preset value to stop nitrogen from being replenished into the transformer body.

[0005] Although the prior art can ensure that the internal pressure of the transformer body is within the normal range during the transportation of the transformer, it does not consider whether the temperature of the transformer body or the working state during the transportation is within the normal range. Therefore, the present application provides a control system for nitrogen filling of explosion-proof transformers, which dynamically adjusts the nitrogen concentration by detecting the temperature, air pressure and voltage and current of the transformer during operation, thereby improving the safety of the transformer and reducing resource waste. Summary of the invention

[0006] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a control system for nitrogen filling of explosion-proof transformers, which monitors the operating status of the explosion-proof transformer, analyzes whether the parameters meet the safety standards, and judges the working status of the transformer, and adjusts the explosion-proof transformer based on the analysis results.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A control system for nitrogen filling of an explosion-proof transformer, which is applied to an explosion-proof transformer, wherein a nitrogen pipeline is provided on the explosion-proof transformer, and a pressure gauge is provided on the nitrogen pipeline;

[0009] The control system comprises: a data analysis module;

[0010] The data analysis module includes a preprocessing unit, an early warning unit, an analysis unit and a control unit;

[0011] The pre-processing unit is used to perform preliminary processing on the received data;

[0012] An upper limit trigger strategy is configured in the early warning unit, and the upper limit trigger strategy evaluates the current working state of the explosion-proof transformer through the set early warning threshold to determine whether to continue working;

[0013] The analysis unit is used to analyze various parameters to determine the safety of various parameters and the working status of the transformer;

[0014] The control unit is used to calculate the adjustment amount of each parameter according to the analysis result, formulate corresponding adjustment strategy, and generate and execute operation instructions.

[0015] Specifically, the upper limit trigger strategy includes temperature adjustment logic and pressure adjustment logic; the temperature adjustment logic is used to adjust the temperature of the explosion-proof transformer, and the pressure adjustment logic is used to adjust the nitrogen pressure of the explosion-proof transformer;

[0016] The upper limit triggering strategy includes:

[0017] Set the upper warning threshold of nitrogen pressure to , the lower warning threshold is , the upper warning threshold of temperature is ;

[0018] Get the nitrogen pressure value in the current state and temperature value , and judging whether the operation data of the explosion-proof transformer exceeds the warning threshold;

[0019] like and , the operating data of the explosion-proof transformer does not exceed the warning threshold and continues to work;

[0020] like , the temperature of the explosion-proof transformer is abnormal, the explosion-proof transformer stops working and executes the temperature adjustment logic;

[0021] like or , the nitrogen pressure of the explosion-proof transformer is abnormal, the explosion-proof transformer stops working and executes the pressure adjustment logic.

[0022] Specifically, the air pressure adjustment logic includes:

[0023] like , open the inflation valve of the explosion-proof transformer and control the nitrogen filling speed to , carry out nitrogen filling operation, the nitrogen filling time is ;

[0024] like , get the oxygen concentration value of the explosion-proof transformer , and set the oxygen threshold concentration to , determine whether the oxygen concentration in the explosion-proof transformer exceeds the standard;

[0025] like , the oxygen concentration in the explosion-proof transformer does not exceed the standard, open the exhaust valve of the explosion-proof transformer, and control the exhaust rate to , release gas operation, exhaust time is ;

[0026] like , the oxygen concentration inside the explosion-proof transformer exceeds the standard, open the exhaust valve of the explosion-proof transformer, release all the gas in the explosion-proof transformer, close the exhaust valve, open the inflation valve to perform inflation operation, and the nitrogen filling time is .

[0027] Specifically, the analysis unit is configured with a critical analysis strategy, a change analysis strategy, and an overall evaluation strategy;

[0028] The critical analysis strategy sets a safe operating range for each parameter and determines whether the parameter is in a safe state;

[0029] The change analysis strategy performs an in-depth analysis on the parameters in the critical analysis strategy that are in a safe state to determine whether the parameter changes are normal;

[0030] The overall evaluation strategy determines whether the overall working state of the explosion-proof transformer is qualified by comprehensively analyzing multiple parameters of the explosion-proof transformer.

[0031] Specifically, the critical analysis strategy includes:

[0032] Extract key parameters from the operating data of explosion-proof transformers;

[0033] Get the parameter values ​​of each parameter in the explosion-proof transformer ;

[0034] Set the upper threshold of the parameter to The lower threshold is , and define the normal operating range of the parameters as , determine whether the parameter value is in an unsafe state;

[0035] like , the parameters are in a safe state;

[0036] like or , the parameter is in an unsafe state.

[0037] Specifically, the change analysis strategy includes:

[0038] Get the parameter values ​​in a safe state in an explosion-proof transformer , ; and calculate the parameter change rate ;

[0039] Set the change rate threshold of the parameter to , determine whether the parameter change is abnormal;

[0040] like , the parameter changes normally and is in a safe state;

[0041] like , the parameter changes abnormally and is in an unsafe state.

[0042] Specifically, the overall evaluation strategy includes:

[0043] Obtain the parameter data set of the explosion-proof transformer , and construct the weight matrix of the parameter data set ;

[0044] Calculate the score of the explosion-proof transformer in the current state ;

[0045] Set the warning threshold to , determine whether to continue to work on the explosion-proof transformer; if , the explosion-proof transformer continues to work; if , the explosion-proof transformer is working abnormally, and the explosion-proof transformer stops working immediately.

[0046] Specifically, the control unit is configured with an adjustment strategy and an execution strategy;

[0047] The adjustment strategy draws a cause-effect diagram by analyzing the operating rules between the results and various parameters, calculates the parameter adjustment amount based on the cause-effect diagram, and adjusts the parameter in an unsafe state to a safe state;

[0048] The execution strategy is used to convert the adjustment plan into an operation instruction, and send and execute the operation instruction.

[0049] Specifically, the adjustment strategy includes:

[0050] Building a monitoring dataset ;

[0051] Calculate the standard deviation of each parameter in the monitoring data set and the covariance between any two parameters ;

[0052] Calculate the correlation coefficient between various parameters , and construct the correlation coefficient matrix ;

[0053] Define the temperature, pressure and flow of the explosion-proof transformer as cause variables, and the remaining parameters as result variables, and draw a cause-effect diagram based on the correlation coefficient matrix;

[0054] According to the causal relationship in the causal graph, the value of the cause variable is preliminarily adjusted, and the value of the result variable is updated in real time;

[0055] determining whether the updated result variable value is within the normal operating range set by the analysis unit;

[0056] If it is within the normal operating range, the adjustment value of the cause variable is output and an adjustment plan is generated;

[0057] If it is not within the normal operating range, continue to iterate until the variable values ​​in the causal diagram are all within the normal operating range.

[0058] Specifically, a data acquisition module and a wireless transmission module;

[0059] The data acquisition module is used to monitor the operating status of the explosion-proof transformer in real time and collect various working parameters of the explosion-proof transformer;

[0060] The wireless transmission module is used to transmit the collected data to the terminal server through wireless transmission technology.

[0061] Specifically, the data acquisition module includes a monitoring unit and a data unit;

[0062] The monitoring unit monitors the operating status and environmental changes of the explosion-proof transformer through a set of equipment sensors;

[0063] The data unit collects the operating parameters of the explosion-proof transformer through a set initial sampling interval.

[0064] Beneficial effects of the present invention:

[0065] 1. Real-time monitoring of abnormal conditions inside the transformer, such as overheating, overvoltage, undervoltage, and abnormal nitrogen pressure; through the set warning threshold, the current working status of the explosion-proof transformer is evaluated and it is quickly determined whether the transformer should continue to work. Once an abnormality is detected, the module can immediately take emergency braking measures to effectively prevent the occurrence of safety accidents.

[0066] 2. Based on the preset normal working range, determine whether the parameters are in a safe working state, and construct a cause-effect diagram. Through the cause-effect diagram, adjust the unsafe parameters to a safe working state, which helps to timely discover and correct potential safety hazards and ensure that the transformer operates within a safe and stable range;

[0067] 3. Formulate and adjust corresponding operation strategies according to the real-time operating status and parameter changes of the transformer, which will help improve the operating efficiency of the transformer and reduce unnecessary energy consumption and losses. BRIEF DESCRIPTION OF THE DRAWINGS

[0068] Figure 1 It is the overall structure diagram of the explosion-proof transformer in the present invention;

[0069] Figure 2 It is a left side view of the explosion-proof transformer of the present invention;

[0070] Figure 3 It is a right side view of the explosion-proof transformer of the present invention;

[0071] Figure 4 This is a structural diagram of a nitrogen-filled control system for an explosion-proof transformer;

[0072] Figure 5 An upper limit trigger flow chart for a nitrogen filling control system for an explosion-proof transformer;

[0073] Figure 6 Analyze the flow chart of a nitrogen filling control system for an explosion-proof transformer;

[0074] Figure 7 This is a control flow chart of a nitrogen filling control system for an explosion-proof transformer. DETAILED DESCRIPTION

[0075] The technical solution of the present invention is described in detail below through the accompanying drawings and specific embodiments. It should be understood that the embodiments of the present invention and the specific features in the embodiments are detailed descriptions of the technical solution of the present invention, rather than limitations on the technical solution of the present invention. The embodiments of the present invention and the technical features in the embodiments may be combined with each other unless there is a conflict.

[0076] Example 1

[0077] refer to Figures 1 to 4 As shown, this embodiment introduces a control system for nitrogen filling of explosion-proof transformers, which is applied to explosion-proof transformers. A nitrogen pipeline is provided on the explosion-proof transformer for protecting the inside of the transformer from nitrogen. A pressure gauge is provided on the nitrogen pipeline. The control system for nitrogen filling of explosion-proof transformers includes: a data acquisition module, a wireless transmission module and a data analysis module;

[0078] The data acquisition module is used to monitor the operating status of the explosion-proof transformer in real time and collect various working parameters of the explosion-proof transformer, including temperature, nitrogen pressure, oxygen concentration, current and voltage;

[0079] The wireless transmission module is used to transmit the collected data to the terminal server through wireless transmission technology, realizing data transmission from the collection point to the terminal, reducing the complexity of wiring, improving the efficiency and reliability of data transmission, and making subsequent maintenance simple and convenient;

[0080] The data analysis module is used to process and analyze the received data, identify abnormal conditions inside the transformer, such as overheating, overvoltage, undervoltage, and abnormal nitrogen pressure, and quickly determine whether the transformer continues to work; based on the preset working parameter range, determine whether the parameters are in a safe working state; according to the operating rules between various parameters, a cause-and-effect diagram is constructed, and based on the cause-and-effect relationship of the cause-and-effect diagram, the parameter adjustment amount under the current state is calculated, and the corresponding parameter adjustment file is generated. An adjustment strategy is formulated, including adjusting the flow rate, pressure, switching of supply status, temperature and output of explosion-proof transformers, generating and executing operating instructions, so that the explosion-proof transformer operates within a safe and stable range, avoiding the occurrence of various safety accidents, and improving the operating efficiency and stability of the transformer.

[0081] Specifically, the data acquisition module includes a monitoring unit and a data unit;

[0082] The monitoring unit monitors the operating status and environmental changes of the explosion-proof transformer through a set of sensor devices; the sensor device set includes high-precision pressure sensors, temperature sensors, oxygen concentration sensors, current and voltage sensors, and flow sensors; the high-precision pressure sensor is used to monitor the pressure value of nitrogen inside the transformer to ensure that the nitrogen pressure is always maintained within a safe range; the temperature sensor is used to monitor the temperature changes inside and around the transformer to identify the situation where heat is generated during operation and causes the temperature to rise, thereby reducing the risk of fire or explosion; the oxygen concentration sensor is used to monitor the changes in oxygen concentration inside the transformer to ensure that the oxygen concentration is lower than the explosion limit and improve the explosion-proof performance; the current and voltage sensors are used to monitor the changes in the output of the transformer during operation; the flow sensor is used to monitor the flow changes during the nitrogen charging and discharging process to ensure that the nitrogen charging and discharging speed is moderate to avoid excessive pressure shock to the transformer;

[0083] The data unit sets the sampling interval for initial data collection , and collect the operating parameters of the explosion-proof transformer according to the sampling interval.

[0084] Specifically, the data analysis module includes a preprocessing unit, an early warning unit, an analysis unit, and a control unit;

[0085] The preprocessing unit is used to perform preliminary processing on the received data, including aligning the sampling time of the received data, using statistical methods to identify and remove data points that do not meet the expected range or obviously deviate from the normal pattern, and merging or deleting duplicate records by traversing the data;

[0086] The upper limit trigger strategy is configured in the early warning unit. The upper limit trigger strategy evaluates the current working status of the explosion-proof transformer through the set early warning threshold and determines whether to continue working. It realizes real-time monitoring and rapid response to the working status of the transformer. For example, if the temperature or nitrogen pressure is abnormal, the power supply is automatically cut off or other protective measures are taken to ensure the safe operation of the transformer, reduce the operation interruption caused by transformer failure, and reduce the maintenance cost and potential safety risks.

[0087] The analysis unit analyzes various parameters to determine whether the parameters are within the preset safety threshold range, whether the parameter changes are abnormal, and evaluate the current working status of the transformer;

[0088] Machine learning mines the changing rules between various parameters, calculates the parameter adjustment amount based on the current operating data of each parameter, and generates the corresponding parameter adjustment file;

[0089] The control unit calculates the adjustment amount of each parameter through analysis results, generates corresponding parameter adjustment files, formulates adjustment strategies, generates operation instructions and sends them to the actuator of the explosion-proof transformer, such as adjusting the nitrogen filling rate, starting or stopping the nitrogen filling equipment, adjusting the operating temperature of the equipment based on the cooler, adjusting the load of the transformer to adjust the output, so as to achieve real-time regulation and optimized operation of the explosion-proof transformer.

[0090] Specifically, the upper limit trigger strategy includes temperature adjustment logic and pressure adjustment logic. The temperature adjustment logic is used to adjust the temperature of the explosion-proof transformer so that it does not exceed the warning threshold, and the pressure adjustment logic is used to adjust the nitrogen pressure of the explosion-proof transformer so that it does not exceed the warning threshold;

[0091] The specific steps of the upper limit triggering strategy include:

[0092] Set the upper warning threshold of nitrogen pressure to , the lower warning threshold is , the upper warning threshold of temperature is ;

[0093] Get the nitrogen pressure value of the explosion-proof transformer in the current state and temperature value , and determine whether the operating data of the explosion-proof transformer exceeds the warning threshold;

[0094] like and , the operating data of the explosion-proof transformer does not exceed the warning threshold and continues to work;

[0095] like , the temperature of the explosion-proof transformer is abnormal, the explosion-proof transformer stops working and executes the temperature adjustment logic;

[0096] like or , the nitrogen pressure of the explosion-proof transformer is abnormal, the explosion-proof transformer stops working and executes the pressure adjustment logic.

[0097] Specifically, the specific steps of the temperature adjustment logic include:

[0098] Control the cooling equipment to reduce the operating temperature of the explosion-proof transformer; and monitor the temperature changes of the explosion-proof transformer in real time. When the cooling equipment stops working, the working temperature of the explosion-proof transformer is normal; is the adjustment threshold temperature of the explosion-proof transformer, and .

[0099] Specifically, the specific steps of the air pressure adjustment logic include:

[0100] like , open the inflation valve of the explosion-proof transformer and control the nitrogen filling speed to , carry out nitrogen filling operation, the nitrogen filling time is , the expression is as follows:

[0101]

[0102] like , get the oxygen concentration value of the explosion-proof transformer , and set the oxygen threshold concentration to , determine whether the oxygen concentration in the explosion-proof transformer exceeds the standard;

[0103] like , the oxygen concentration in the explosion-proof transformer does not exceed the standard, open the exhaust valve of the explosion-proof transformer, and control the exhaust rate to , release gas operation, exhaust time is , the expression is as follows:

[0104]

[0105] like , the oxygen concentration inside the explosion-proof transformer exceeds the standard, open the exhaust valve of the explosion-proof transformer, release all the gas in the explosion-proof transformer, then close the exhaust valve, open the inflation valve to inflate, and the nitrogen filling time is , the expression is as follows:

[0106]

[0107] The oxygen concentration inside the transformer is reduced through exhaust and nitrogen filling operations, which reduces the generation of acid or water, which is corrosive to the internal electrical components. At the same time, the occurrence of fire or explosion incidents is reduced. The introduction of inert gas improves the explosion-proof capability of the transformer, allowing it to maintain structural integrity when facing external explosion pressure.

[0108] Specifically, critical analysis strategy, change analysis strategy and overall evaluation strategy are configured in the analysis unit;

[0109] The critical analysis strategy sets a safe operating range for each parameter and determines whether each parameter is in a safe state. If a parameter exceeds or falls below the set threshold, the parameter is considered to be in an unsafe state.

[0110] The change analysis strategy is used to conduct in-depth analysis on the parameters in the critical analysis strategy that are in a safe state to determine whether the parameter changes are normal. By analyzing the change trends of various parameters, if the change rate of a parameter exceeds a certain rate within a period of time, the parameter is considered to be in an unsafe state.

[0111] The overall evaluation strategy conducts a comprehensive analysis of multiple parameters of the explosion-proof transformer to determine whether the overall working status of the explosion-proof transformer is qualified.

[0112] Specifically, the specific steps of the critical analysis strategy include:

[0113] Extract key parameters from the operating data of explosion-proof transformers, including but not limited to: nitrogen pressure, temperature, flow, voltage, current;

[0114] Get the parameter values ​​of each parameter of the explosion-proof transformer in the current state ;in, The extracted parameters are The parameter values ​​of the parameters and define the number of parameters extracted from the transformer as , ,like is the parameter value of nitrogen pressure in the current state, is the parameter value of the current in the current state;

[0115] Set upper thresholds for each parameter and lower threshold , and define the normal operating range of each parameter , to determine whether the parameter is in an unsafe state; among them, , Respectively The upper and lower thresholds of the parameters are used to determine Is it in a safe state, and ;

[0116] like , the parameters are in a safe state;

[0117] like or , the parameter is in an unsafe state, and the parameter is marked as an unsafe parameter.

[0118] Specifically, the specific steps of the change analysis strategy include:

[0119] Get the parameter values ​​in a safe state in an explosion-proof transformer , ; and calculate the parameter change rate , the expression is as follows:

[0120]

[0121] in, is the sampling time interval, is the parameter value of the explosion-proof transformer in the current state, For explosion-proof transformers in front Parameter value of the time period;

[0122] Set the parameter change rate threshold to , determine whether the parameter changes abnormally;

[0123] like , parameter changes are normal and in a safe state;

[0124] like , the parameter changes abnormally and is in an unsafe state, so the parameter is marked as an unsafe parameter.

[0125] Specifically, the specific steps of the overall assessment strategy include:

[0126] Get the parameter data set of the explosion-proof transformer in the current state , and construct the weight matrix of the parameter data set ;

[0127] Calculate the score of the explosion-proof transformer in the current state , the expression is as follows:

[0128]

[0129] In the formula, is the weight matrix Weight value, For parameters The matching score is represented by binary 0 or 1; if In normal range Inside, then ;like In abnormal range Inside, then ;

[0130] Set the warning threshold to , determine whether to continue to work on the explosion-proof transformer; if , the explosion-proof transformer continues to work; if , the explosion-proof transformer is working abnormally, and the explosion-proof transformer stops working immediately.

[0131] Specifically, the weight matrix in the change analysis strategy The build includes:

[0132] Collect a data set containing multiple parameter and sample values ​​and construct a data matrix , is the number of parameters, is the number of samples collected, For the The parameter Sample values;

[0133] The data in the data matrix are standardized using the range change method to obtain a standardized data sequence. ; Among them, the positive indicator is used to process the data, and the expression of the positive indicator standardization is as follows:

[0134]

[0135] In the formula, For the The sample in The value of the parameter, , ;

[0136] Calculate the The sample in The proportion of parameters ; The expression is as follows:

[0137]

[0138] Calculate the entropy value of each parameter according to the specific gravity ; The expression is as follows:

[0139]

[0140] Calculate the weight of each parameter according to the entropy value , and construct the weight matrix ; The expression of weight is as follows:

[0141]

[0142] In the formula, For the The weight of the parameter.

[0143] Specifically, the control unit is configured with an adjustment strategy and an execution strategy;

[0144] The adjustment strategy draws a cause-effect diagram of each parameter by analyzing the operating rules between the results and various parameters, performs iterative operations based on the cause-effect diagram, generates parameter adjustment amounts, and formulates corresponding adjustment plans to adjust the parameters in an unsafe state to a safe state;

[0145] The execution strategy is used to convert the adjustment plan into operation instructions, send and execute the operation instructions.

[0146] Specifically, the steps to adjust the strategy include:

[0147] Building a monitoring dataset ,in, , , , As parameters, , , , is the parameter value, is the number of sampling points;

[0148] Calculate the standard deviation of each parameter , the expression is as follows:

[0149]

[0150] In the formula, For the The standard deviation of the parameter, For the The first of the parameters Sample data, for The mean of ;

[0151] Calculate the covariance between any two parameters , the expression is as follows:

[0152]

[0153] Calculate the correlation coefficient between each parameter , and construct the correlation coefficient matrix ; The expression of the correlation coefficient is as follows:

[0154]

[0155] In the formula, Reflects the parameters and parameters the strength and direction of the linear relationship between

[0156] Define the temperature, pressure, and flow of the explosion-proof transformer as cause variables, and the remaining parameters as result variables, and draw a cause-effect diagram based on the correlation coefficient matrix; in the diagram, use arrows to represent cause-effect relationships, the arrows point to the result variables, the starting point of the arrows is the cause variable, and the strength and direction of the cause-effect relationship are marked on the arrows, such as "positive correlation" and "negative correlation";

[0157] When an unsafe parameter is identified in the analysis unit, the operating parameters of the explosion-proof transformer in the current state are obtained and the operating parameters are filled into the cause-effect diagram;

[0158] According to the causal relationship in the causal diagram, the first iteration is carried out to preliminarily adjust the value of the cause variable, and at the same time update the value of the adjusted result variable in real time; the adjusted value of the cause variable should be controlled within the normal operating range set in the analysis unit;

[0159] Determine whether the updated result variable value is within the normal operating range set by the analysis unit;

[0160] If it is within the normal operating range, the adjustment value of the cause variable is output and an adjustment plan is generated;

[0161] If it is not within the normal operating range, continue to iterate and adjust the value of the cause variable until the variable values ​​in the cause-effect diagram are all within the normal operating range.

[0162] In summary, the present invention monitors the operating status of the explosion-proof transformer in real time, compares the actual operating data with the set alarm threshold, determines whether to take emergency braking for the explosion-proof transformer and immediately executes the adjustment logic; performs parameter abnormality analysis on the transformer for which no emergency formulation is taken, determines whether the parameter is in a safe state by setting the operating critical threshold of each parameter, performs further change abnormality analysis on the parameters in the safe state, determines that the parameters with abnormal change rate are in an unsafe state, and evaluates the overall state of the transformer after the abnormal analysis is completed, and determines whether emergency braking is performed using a scoring formula; for transformers with unsafe parameters; obtains the adjustment amount of each parameter by constructing a cause-and-effect diagram and generates an adjustment plan, and executes the adjustment plan.

[0163] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A control system for nitrogen filling of explosion-proof transformers, applied to explosion-proof transformers, wherein the explosion-proof transformer is provided with a nitrogen pipeline, and the nitrogen pipeline is provided with a pressure gauge, characterized in that ； The control system comprises: a data analysis module; The data analysis module includes a preprocessing unit, an early warning unit, an analysis unit and a control unit; The pre-processing unit is used to perform preliminary processing on the received data; An upper limit trigger strategy is configured in the early warning unit, and the upper limit trigger strategy evaluates the current working state of the explosion-proof transformer through the set early warning threshold to determine whether to continue working; The analysis unit is used to analyze various parameters to determine the safety of various parameters and the working state of the transformer; The control unit is used to calculate the adjustment amount of each parameter according to the analysis result, formulate corresponding adjustment strategy, and generate and execute operation instructions.

2. A nitrogen filling control system for explosion-proof transformers according to claim 1, characterized in that: The upper limit trigger strategy includes temperature adjustment logic and air pressure adjustment logic; The temperature adjustment logic is used to adjust the temperature of the explosion-proof transformer, and the pressure adjustment logic is used to adjust the nitrogen pressure of the explosion-proof transformer; The upper limit triggering strategy includes: Set the upper warning threshold of nitrogen pressure to , the lower warning threshold is , the upper warning threshold of temperature is ; Get the nitrogen pressure value in the current state and temperature value , and judging whether the operation data of the explosion-proof transformer exceeds the warning threshold; like and , the operating data of the explosion-proof transformer does not exceed the warning threshold and continues to work; like , the temperature of the explosion-proof transformer is abnormal, the explosion-proof transformer stops working and executes the temperature adjustment logic; like or , the nitrogen pressure of the explosion-proof transformer is abnormal, the explosion-proof transformer stops working and executes the pressure adjustment logic.

3. A nitrogen filling control system for explosion-proof transformers according to claim 2, characterized in that: The air pressure adjustment logic includes: like , open the inflation valve of the explosion-proof transformer and control the nitrogen filling speed to , carry out nitrogen filling operation, the nitrogen filling time is ; like , get the oxygen concentration value of the explosion-proof transformer , and set the oxygen threshold concentration to , determine whether the oxygen concentration in the explosion-proof transformer exceeds the standard; like , the oxygen concentration in the explosion-proof transformer does not exceed the standard, open the exhaust valve of the explosion-proof transformer, and control the exhaust rate to , release gas operation, exhaust time is ; like , the oxygen concentration inside the explosion-proof transformer exceeds the standard, open the exhaust valve of the explosion-proof transformer, release all the gas in the explosion-proof transformer, close the exhaust valve, open the inflation valve to perform inflation operation, and the nitrogen filling time is .

4. A nitrogen filling control system for explosion-proof transformers according to claim 3, characterized in that: The analysis unit is configured with a critical analysis strategy, a change analysis strategy and an overall evaluation strategy; The critical analysis strategy sets a safe operating range for each parameter and determines whether the parameter is in a safe state; The change analysis strategy performs an in-depth analysis on the parameters in the critical analysis strategy that are in a safe state to determine whether the parameter changes are normal; The overall evaluation strategy determines whether the overall working state of the explosion-proof transformer is qualified by comprehensively analyzing multiple parameters of the explosion-proof transformer.

5. A nitrogen filling control system for explosion-proof transformers according to claim 4, characterized in that: The critical analysis strategy includes: Extract key parameters from the operating data of explosion-proof transformers; Get the parameter values ​​of each parameter in the explosion-proof transformer ; Set the upper threshold of the parameter to The lower threshold is , and define the normal operating range of the parameters as , determine whether the parameter value is in an unsafe state; like , the parameters are in a safe state; like or , the parameter is in an unsafe state.

6. A nitrogen filling control system for explosion-proof transformers according to claim 5, characterized in that: The change analysis strategy includes: Get the parameter values ​​in a safe state in an explosion-proof transformer , ; and calculate the parameter change rate ; Set the change rate threshold of the parameter to , determine whether the parameter change is abnormal; like , the parameter changes normally and is in a safe state; like , the parameter changes abnormally and is in an unsafe state.

7. A nitrogen filling control system for explosion-proof transformers according to claim 6, characterized in that: The overall assessment strategy includes: Obtain the parameter data set of the explosion-proof transformer , and construct the weight matrix of the parameter data set ; Calculate the score of the explosion-proof transformer in the current state ; Set the warning threshold to , determine whether to continue to work on the explosion-proof transformer; if , the explosion-proof transformer continues to work; if , the explosion-proof transformer is working abnormally, and the explosion-proof transformer stops working immediately.

8. The nitrogen filling control system for explosion-proof transformers according to claim 7, characterized in that: The control unit is configured with an adjustment strategy and an execution strategy; The adjustment strategy draws a cause-effect diagram by analyzing the operating rules between the results and various parameters, calculates the parameter adjustment amount based on the cause-effect diagram, and adjusts the parameter in an unsafe state to a safe state; The execution strategy is used to convert the adjustment plan into an operation instruction, and send and execute the operation instruction.

9. A nitrogen filling control system for explosion-proof transformers according to claim 8, characterized in that: The adjustment strategies include: Building a monitoring dataset ; Calculate the standard deviation of each parameter in the monitoring data set and the covariance between any two parameters ; Calculate the correlation coefficient between various parameters , and construct the correlation coefficient matrix ; Define the temperature, pressure and flow of the explosion-proof transformer as cause variables, and the remaining parameters as result variables, and draw a cause-effect diagram based on the correlation coefficient matrix; According to the causal relationship in the causal graph, the value of the cause variable is preliminarily adjusted, and the value of the result variable is updated in real time; determining whether the updated result variable value is within the normal operating range set by the analysis unit; If it is within the normal operating range, the adjustment value of the cause variable is output and an adjustment plan is generated; If it is not within the normal operating range, continue to iterate until the variable values ​​in the causal diagram are all within the normal operating range.

10. A nitrogen filling control system for explosion-proof transformers according to claim 9, characterized in that: Also includes: Data acquisition module and wireless transmission module; The data acquisition module is used to monitor the operating status of the explosion-proof transformer in real time and collect various working parameters of the explosion-proof transformer; The wireless transmission module is used to transmit the collected data to the terminal server through wireless transmission technology.

11. A nitrogen filling control system for explosion-proof transformers according to claim 10, characterized in that: The data acquisition module includes a monitoring unit and a data unit; The monitoring unit monitors the operating status and environmental changes of the explosion-proof transformer through a set of equipment sensors; The data unit collects the operating parameters of the explosion-proof transformer through a set initial sampling interval.

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